In an interview airing Monday on Anderson Cooper's new talk show, Mitch Winehouse says that while toxicologists didn't find any illegal drugs in Amy's system at the time of her death, they did find traces of a prescription drug she had been using to help detox from alcohol. Mitch explains she was taking Librium, an anti-anxiety medication that he describes as a "normal drug given to people who are detoxing [from alcohol] that decreases the risk of people having seizures." He speculates that she may have died from a detox seizure: "Everything Amy did she did to excess. She drank to excess and did detox to excess." An official inquest will determine her final cause of death.